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reddysaxar
1)AC=(2-4;5-1)=(-2;4)
BC=(2+3;5-7)=(5;-2)
AC*BC=-2*5+4*(-2)=-10-8=-18
2)x=5/2+3/2y
5x-7y=-2
5(5/2+3/2y(-7y=-2
y=-29
x=5/2+3/2*(-29)
x=-41
3)не помню уже

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